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   1 # void pq\Connection::listenAsync(string $channel, callable $listener)
   2
   3 [Asynchronously](pq/Connection/: Asynchronous Usage) start listening on $channel for notifcations.
   4 See pq\Connection::listen().
   5
   6 ## Params:
   7
   8 * string $channel
   9   The channel to listen on.
  10 * callable $listener as function(string $channel, string $message, int $pid)
  11   A callback automatically called whenever a notification on $channel arrives.
  12
  13 ## Throws:
  14
  15 * pq\Exception\InvalidArgumentException
  16 * pq\Exception\BadMethodCallException
  17 * pq\Exception\RuntimeException